Hi guys I haven't posted a long time. As I said this will be slow build. I have to jump from work to work. The nature doesn't wait, a lot of season work in vineyard, spraying...and so. It took a lot of time at weekends. Here's the picture.

Finally the parts arrived. Released from customs. I ordered according to above quote.
It seems to be Ok but timing pulleys don't make me happy.
The gear ratio I plan to make reducers is 1:3.
Pulleys are 60 / 20 teeth Type T5.

It can be clearly seen that there is backlash between T5 belt and 60 teeth pulley. I can not see on 20 teeth pulley coz of flanges.

Reason you most likely won't notice any backlash after installing the entire stuff on your machine is your reduction, and the amount of teeth in mesh will make it dissappear. That's the benefit of pulley and belts vs meshed gears.

What will happen with backlash, it depends on loads, while steppers run forward after backward and reverse. I'm worried about this, doesn't make me happy, but if you guys say so than I'll sleep well at the very beginning.
Thank you guys.

Sixteen months have been passed since my last post but I have not stopped reading the forum. Yes, the machine building was delayed, but I had to prepare surface fundamental for the beast. I got approved ( green light from wife ) and started to adapt the future workshop.

For the start I would need for a angle grinder ( big one ) that I intend to use as a chop saw. The choice was chinese industrial tools brand INGCO. It's something between quality and price. Powerfull grinder 2100 W.

Steel cut and construction started (angle grinder did nice and precise cuts ). The metal frame will be all joined with screws. Steel was new but stayed couple of months outside, there is surface corrosion which I will remove before painting.

If you are indeed bolting all joints only ( I notice the tackwelds, but I think for drilling only ? ) you better use two bolts on those joints to create a more rigid construction. One bolt creates a pivoting joint where the table surface mdf and front and back frame are the only parts preventing racking from quare to parallelogram. In Cnc table frames you want everything as square and rigid as you can. If you weld the subbeams you do not have the pivot action.

If you are indeed bolting all joints only ( I notice the tackwelds, but I think for drilling only ? ) you better use two bolts on those joints to create a more rigid construction. One bolt creates a pivoting joint where the table surface mdf and front and back frame are the only parts preventing racking from quare to parallelogram. In Cnc table frames you want everything as square and rigid as you can. If you weld the subbeams you do not have the pivot action.

Thank you Fox for your advice. You are right, there is possibility for pivoting, except I Secure the bolts for front and back frame with legs ( easier one ) than drilling second hole in crossbeams and beams ( there is no access / or one side of '[' channel must be additionally cut off for drill access what does not make me happy ). I want to use as less as possible welds because I would like to leave a chance for disassemble, moving and transporting, otherwise it would be pity to cut and grind this awesome machine.

I started building from upside down. Drilled also holes for bolting cross bearers on lowest frame horizontal parts ( for eventually future moving bed, lower for cca. 600mm, and upgrading the machine to another version, who knows? ).